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A client of mine send me a .obj file (which was exported out of a CAD file). But on importing into Blender, I noticed the round shapes aren't like they are supposed to, see image attached. Is there any way to fix this, besides fixing all the vertices manual? enter image description here

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    $\begingroup$ Blender only reads whatever information is already in the file, if shapes aren't round enough it is because they were not exported round enough. With topology like that there's is little you can do to get decent results other than manually fix. $\endgroup$ – Duarte Farrajota Ramos Jul 7 at 10:03
  • $\begingroup$ @DuarteFarrajotaRamos, I was afraid so, thanks Duarte! $\endgroup$ – Jurian Jul 7 at 10:14
  • $\begingroup$ @DuarteFarrajotaRamos Would there be any way to get a better import from CAD to Blender though? I only got the .obj conversion from my client, but maybe I could ask them for a different conversion. $\endgroup$ – Jurian Jul 7 at 10:20
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    $\begingroup$ Related: Importing models from AutoCAD to Blender $\endgroup$ – Jachym Michal Jul 7 at 10:38
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    $\begingroup$ Most CAD-suites should have an options panel in the export tool, where you can specify face size and angle threshold for mesh export. It's a tradeoff between file size and detail, you might want to experiment a bit with the values to find the best setting for your needs. Alternatively, you could look into the stepper-tool (gumroad.com/l/stepper), which can convert CAD formats into blender. It's not free, though. $\endgroup$ – haarigertroll Jul 7 at 12:59
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If the mesh hasn't been tampered with, I'm guessing this is a situation caused by incorrect smoothing information. A normals related issue.

Make sure when you export, you export the smoothing information correctly. After importing it into blender you have 'shade smooth' set, and then play with auto-smooth angle.

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